The initial amount of thorium-232 in a rock is determined to be 6.78mg. it now has 5.32 mg of thorium-232 left how old is the rock if the half life of thorium-232 is 14.7 billion years?

Q: D. The half-life of 210Pb is 21 years. How old is a painting in which the activity of 210Pb activity…

A: Calculation

Q: A wooden artifact is burned and found to contain 21g of carbon. The 14 C activity of the sample is…

A:

Q: If 3.0 grams of Strontium-90 in a rock sample remained in 1989, approximately how many grams of…

A: In radioactive decay unstable nuclei decay into stable nuclei with emmison of some electromagnetic…

Q: A dinosaur remain has a C-14 isotope and has a half-life of 5,715 years. The activity of this is…

A:

Q: Use the References to access important values if needed for this question. The radioactive isotope…

A: To find half life.

Q: Technetium-99m has a half-life of 6.01 hours. If a patient injected with technetium-99m is safe to…

A: Half-life: The half-life of a chemical reaction is time needed for half of an initial concentration…

Q: The half-life of Ga-67 is 77 9 hours. How long will it take Ga-67 to decay and lose 95% of its…

A: Given  Half life of Ga- 67 = 77.9 hours  decay % = 95 %  Time ( t ) = ?

Q: The half-life of 234U, uranium-234, is 2.52 105 yr. If 98.9% of the uranium in the original sample…

A:

Q: If the half-life of a parent material is 10 Ma, and about 88% (rounded) has decayed to daughter…

A:

Q: The half-life of 238U is 4.5 * 109 yr. A sample of rock of mass 1.6 gproduces 29 dis>s. Assuming…

A: The given data contains, mass = 1.6 g. half life=4.5×109 year.

Q: An old piece of wood has a carbon-14 content of 0.0156 times that 14 is the age of the old wood if…

A: We will use first order kinetics formula

Q: a wooden object from the site of an ancient temple has a carbon-14 activity of 10 counts/min…

A:

Q: An artifact is found that has 33% of the 14C it had when it was living. How long ago was this…

A:

Q: A sample of gas from a basement containing radon-222 has an activity of 7 pCi/L, which is above the…

A:

Q: The half life of Radium-226 is 1590 years. If a sample contains 500 mg, how many mg will remain…

A: given :-  initial amount of sample = 500 mg  half life = 1590 years  To calculate :-  amount of…

Q: If 29.5% of the original amount of 14C is present in a wooden tool at the time of analysis, what is…

A: Since the carbon decay is a first order kinetics reaction Hence for the first order reaction we can…

Q: Iodine-131 has half life of 9 days meaning that after every 9 days the amount of isotope is reduced…

A: The half-life of Iodine-131 is 9 days. Initial amount =10.0 g  Time = 18 days. 18 days means => 9…

Q: The half-live of americium-241 is 432 y. If 0.0002 g of americium-241 is present in a smoke detector…

A: Given: Mass of isotope = 0.0002 g. Half-life of isotope = 432 yr.

Q: [References) A rock containing 8 mg of plutonium-239 per kg of rock is found in a glacier. The…

A: Radioactive decay, also known as radioactive disintegration, is when an unstable nucleus loses its…

Q: A rock containing 238U and 206Pb was examined to determine its approximate age. The molar ratio of…

A: Given half-life of U-238, t1/2 = 4.500*109 year  Decay constant, λ = 0.693t1/2 => λ =…

Q: A 26.00-g sample of water containing tritium, 31H, emits1.50 x 103 beta particles per second.…

A: In radioactive decay, radioactive atom's nuclei (unstable) eject energy as well as charged particles…

Q: The half life of radium 226 is 1602 years. If you have 500 grams of radium today how many grams…

A:

Q: How much of a 24- gram sample of Radium -226 will remain unchanged at the end of three half- life…

A: Radium-226 is a radioactive element. Here 24 g of the radium sample undergoes radioactive decay. The…

Q: Radium-221 has a half life of 30 seconds. How long will it take for 82% of a sample to decay?

A: Half life =30 seconds Decay percentage = 80%

Q: An unknown radioactive element decays into non-radioactive substances.  In 660 days the…

A: Rate constant (k)= 2.303/t log 100/49 So k = (2.303/660) ×0.3098 =0.0011 days ^-1

Q: A radioactive waste from a clinical laboratory contains 0.2 µCi (microcuries) of calcium-45 (45Ca)…

A: Answer -

Q: A moon rock collected by a U.S. Apollo mission is estimated to be 3.70 billion years old by…

A: Calculate the value of rate constant (k):

Q: carbon as a piece of modern charcoal. How long ago was the tree burned to make the ancient charcoal?…

A:

Q: Half life iridium 192 is 106.51 days. How many days are required for 60 mg to decay to 7.5 mg

A:

Q: A bottle of wine, which was analyzed for its tritium (3H) content, was found to contain 12.30% of…

A: Given: The half-life of tritium (t1/2) = 12.3 years  Amount left of tritium = 12.3 ℅

Q: The half-life of copper-67 is 61 hours.  If an original sample contains 24 grams how many grams are…

A:

Q: The​ half-life of​ silicon-32 is 710 years. If 20 grams is present​ now, how much will be present…

A: Radioactive decay is always a first order reaction. The rate equation for the radioactive decay is :…

Q: A bottle of wine, which was analyzed for its tritium (hydrogen-3) content, was found to contain…

A:

Q: Assume that all the 206Pb found in a given sample of uranium ore resulted from decay of 238U and…

A: Radioactive decay is the disintegration of unstable nuclei by losing their energy in the form of…

Q: A bottle of vintage red wine has lost its label. The concentration of tritium in the wine is 0.34…

A: Radioactive decay reactions are the first order reactions in which the rate of decay of a…

Q: A wooden artifact is burned and found to contain 21 g of carbon. The 14C activity of the sample is…

A:

Q: A wooden artifact is burned and found to contain 21g of carbon. The ^14C activity of the sample is…

A: A freshly cut sample of a wood has the activity of 14C = 15 disintegrations per min per gram (fixed)

Q: The half-life of Po-214 is 0.001 seconds. How much of a 10 gram sample is left after 0.003 seconds?…

A: We know radioactive decay follows first order reaction kinetics, therefore  t1/2=0.001 s and…

Q: Rubidium-87 decays by β production to strontium-87 with a half-life of 4.7 × 1010 years. What is the…

A: Since the Sr is forming by the decay of Rb  Ans since 1 mole of Rb will decay to form 1 mole of Sr…

Q: Technetium-99 which has a half life of 6 hours is a useful isotope in diagnostic tests. If a patient…

A:

Q: rock containing 238U and 206Pb was examined to determine its approximate age. The molar ratio of…

A:

Q: Predict the mode of decay of (a) plutonium-239,(b) indium-120.

A: (a) Plutonium-239: The atomic number (Z) of plutonium ( Pu) is 94. So, plutonium-239 has 94 protons…

Q: A rock contains a Pb-206 to U-238 mass ratio of 0.473:1.00. Assuming the rock did not contain any…

A:

Q: After 103 days, only 2.3 g of a radioisotope remains from a sample that originally has 150 g of it.…

A:

Q: How much of a 24 gram sample of radium 226 will remain unchanged at the end of three half life…

A: Given, sample of radium-226 has mass of 24 gram.

Q: Polonium 209 (Po-209) has a half life of 103 years. How long would it take a 100-g sample to decay…

A:

Q: Technetium-99 which has a half life of 6 hours is a useful isotope in diagnostic tests. If a patient…

A:

Q: Thorium-227 has a half-life of approximately 19 days. What percentage of an original amount of…

A: